Television scanning device



Oct. 13, 1931. s c 1,826,836

TELEVISION SCANNING DEVICE Filed May 1, 1930 2 Sheets-Sheet 1 A llorney Oqt. 13, 1931. v s c o 1,826,836

TELEVISION SCANNING DEVICE Filed May 1, 1930 2 Sheets-Sheet 2 Invenlor MK. Jfa 0&0

By Allomey Patented Oct. 13,1931 7 UNITED STATES MICHAEL STACHO, or cLnvn'ri-Ann onroe A TELEVISION scAnNr-Ne time:

'Thisinvention relates to new and useful improvements in the art of television and 'more'particularlytoa scanning device for use in television apparatus." a V The primary object of the invention is to provide, in 'almanner. as hereinafter set forth, a television scanning device embodying 'a pair of opposed, co-acting rotary disks which are provided with a novel arrangement of intersecting slots.

Another importantobject of the invention is to provide a television scanning device of the character described embodying a pair of rotatably mounted disks having co-acting intersecting slots therein for the passage of the light pencils or beams, one of said disks further having operatively associated therewith electromagnetic means for retarding or dragging the same at the completion of each revolution in a manner to cause the'same to rotate periodically at a reduced speed as compared with the other disk.

Other objects of the invention are to provide a television scanning device of the character set forth which will be simple in construction, strong, durable, eflicient in its use and which may be manufactured at low cost.

All of the foregoing and still further objects and advantages of the invention may become apparent'from a study of the following specification, taken inconnectlon w th the accompanying drawings wherein like characters of reference designate corresponding parts throughout the several views, and

therein Figure 1 is a vertical longitudinal sectional view of a television scanning device constructed in accordance with this invention. Figure 2 is a sectional view taken substantially on the line 2-2 of Figure 1 look ng in the direction indicated by the arrows.

Figure 3 is a detail view in elevation showing the scanning disk with which the electromagnetic means is operatively associated.

Referring to the drawings in detail, itwillj be seen that thereference numeral 1 desig-.

of the motor 3..

Figure 4 is a detail view in elevation show-' nates a base upon which is mounted-a stand;

f A pplication filed May 1,1930.: seriarnkiiaiaeea lard 2 whichs pp its, an electric 'motor 3 which is energized through theconductor wiresel and 5. Arheostat 6' is'interposed in the conductor wire 4: for controlling'the speed The armature shaft? of the 1notor"3;projects forwardly therefrom and is provided with an obtuse free end portion 8 which terminates in a'flat' foot'9 to which issecured byany suitablemeans a disk l0 having a aa radially dlsposed slot. 11 extending from'its center to a point adjacent theinargina-ledge of'said disk: Thedi'sk l0 is disposed co- .aX'ially with respect to the main portionof thejarmature shaft- 75 The mar'gina-l'por 'tion ofthe disklO is,fcirmed to provide a forwardly and inwardly curved flange 12;;-

" A disk 13 isfdisp'osed in frictional engagement with the forward base of ,the' disk 1 0 and is provided Vania-carved,magm ti flange 14 disposed withinth e;flange*12 of the disk 10.1. The 'disk 13is providedwith a spiral slot 15 extending fr-oln'a 'central ort tion thereof to a point, adj acent the"per1ph-- cry, of said diskfas, clearly; illustrated Figure 30f the drawings; f' A' reflector 16 isY-fixedbnthe armature shaft 7 in spaced relation tothe disk 10by any suitable means, said arm'atureshaft be ing shown provided-with flange *17 against which. the reflector *16 is 'disposedJ A neon flightitube 18 is disposedbetween jth'e disk 10 anti the; reflector 16.; lens 19 is mount ed forwardly of the diskf13 in an opening fprovided thereforfin the supporting s'tnic-i ture 20 which is'mounted on thebase 1;

Disposed adj acent, the forward side" of: the

disk 13 at the marginal Iporti'on thereofis an electro magnet 21 whichis energized from any suitablesource throughth'e 'medium of 9 the conductoriwires' 22: Mounted*onthe for-i ward side of thejdisk13 atfa point" adjacent fthe'outer en'dof .the slot, 15 isT-a disk of magneticf manna which passes;the magnet 21 iii close relation theretojupo'n rotation of -9 said 7 disk is." Also, mountediinispaeed 61a; tion on the forward sideof the f disk 13 is a p u ality of counterweights'zat' am n-ma tic mate ialywhi ch are-forthe' pu rposef counterbalancingzthe ma-themes 1 Was In operation, the motor 3 is energized to rotate the shaft 7 and the disk 10 and the disk 13 which is mounted on said disk 10. l/Vhen the magnetic lug or disk 23 on the disk 13 passes the electromagnet 21, the same is attracted thereto and the rotary movement of said disk 13 is retarded as compared with the speed of the disk 10.

It is understood, of course, that the disk 13 is rotated by the disk 10 by reason ofthe fact that the same is supported thereon and frictionally engaged therewith and the magnet 21 is of sufiicient strength to overcome the frictional connection between the disk 13 and the disk 10. The retarding or dragging of the disk 13 occurs once in every complete revolution of said disk. hen the speed of thedisk 13 falls below that of the disk 10, the point at which the spiral slot 15 intersects the radial slot 11 moves progressively outward by reason of the difference in the speed at which the two disks are rotated, as

will be readily understood. The pencil or beam of light is projected from the disks through the lens 19 and on to the subject 4 (not shown) .It is. believed that the many advantages of a television scanning device constructed in accordance with this 1nvent1on will be read- .ily understood, and although the preferred embodiment of the invention is as illustrated and described, it is to be understood that changes in the details of construction may be had which will fall within the scope of the invention as claimed.

What is claimed is 1. A television scanning device of the character described comprising a pair of rotatable disks having slots therein for the pas- I sage of light to a subject, and magnetic means for periodically retarding the rotation of one of said disks with respect to the other of said disks with each revolution thereof.

2. A television scanning device of the character described comprising a disk mounted for rotation, another disk mounted on the first named disk for rotation therewith and means for periodically retarding the speed of rotation of the second named disk with respect to the first named disk, said disks being provided with slots for the passage of light to a subject.

3. A television scanning device of the character described comprising a rotary disk, said disk being provided with a radial slot, an-

other disk mounted 011 the first named disk for frictional. rotation therewith and having a spiralslot intersecting the slot of the first named disk and means for retarding the speed of rotation of the second named disk with respect to the first named disk at the end of each revolution thereof.

4. Atelevision scanning device of the character described comprising a rotary disk having a radial slot therein, another disk mounted on the first named disk and frictionally engaged therewith for rotation thereby, said second named disk being provided with a spiral slot intersecting the slot of the first named disk and means for periodically decreasing the speed of rotation of the second named disk below the speed of rotation of the first named disk.

5. A television scanning device of the character described comprising a rotatable disk having a radial slot therein, a flange on the marginal portion of the disk, another disk mounted on'the first named disk and frictionally engaged therewith for rotation thereby and having a spiral slot therein intersecting the slot in the firstnamed disk, a flange on the marginal portion of the second named disk disposed in the flange of the first named disk, and means for decreasingthe speedof rotation of the second nameddisk at the end of each revolution of the same relative to the speed of rotation of the first named disk.

In testimony whereof I afiiX my signature. 

